Battle final boss Bowser with this cool Expansion Set for your LEGO® Super Mario™ Starter Course. Flip the Lava Bubble out of the way to enter Bowser’s castle. Knock Dry Bones off the shaking platform. Fend off Boo chasing you around the tower. Stomp on flippers to raise Bowser's arms and collect rewards from the ? Block and Time Block. Then shake the bridge until Bowser falls over to triumph!